cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

sgx.h (2779B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _X86_SGX_H
      3#define _X86_SGX_H
      4
      5#include <linux/bitops.h>
      6#include <linux/err.h>
      7#include <linux/io.h>
      8#include <linux/rwsem.h>
      9#include <linux/types.h>
     10#include <asm/asm.h>
     11#include <asm/sgx.h>
     12
     13#undef pr_fmt
     14#define pr_fmt(fmt) "sgx: " fmt
     15
     16#define EREMOVE_ERROR_MESSAGE \
     17	"EREMOVE returned %d (0x%x) and an EPC page was leaked. SGX may become unusable. " \
     18	"Refer to Documentation/x86/sgx.rst for more information."
     19
     20#define SGX_MAX_EPC_SECTIONS		8
     21#define SGX_EEXTEND_BLOCK_SIZE		256
     22#define SGX_NR_TO_SCAN			16
     23#define SGX_NR_LOW_PAGES		32
     24#define SGX_NR_HIGH_PAGES		64
     25
     26/* Pages, which are being tracked by the page reclaimer. */
     27#define SGX_EPC_PAGE_RECLAIMER_TRACKED	BIT(0)
     28
     29/* Pages on free list */
     30#define SGX_EPC_PAGE_IS_FREE		BIT(1)
     31
     32struct sgx_epc_page {
     33	unsigned int section;
     34	u16 flags;
     35	u16 poison;
     36	struct sgx_encl_page *owner;
     37	struct list_head list;
     38};
     39
     40/*
     41 * Contains the tracking data for NUMA nodes having EPC pages. Most importantly,
     42 * the free page list local to the node is stored here.
     43 */
     44struct sgx_numa_node {
     45	struct list_head free_page_list;
     46	struct list_head sgx_poison_page_list;
     47	unsigned long size;
     48	spinlock_t lock;
     49};
     50
     51/*
     52 * The firmware can define multiple chunks of EPC to the different areas of the
     53 * physical memory e.g. for memory areas of the each node. This structure is
     54 * used to store EPC pages for one EPC section and virtual memory area where
     55 * the pages have been mapped.
     56 */
     57struct sgx_epc_section {
     58	unsigned long phys_addr;
     59	void *virt_addr;
     60	struct sgx_epc_page *pages;
     61	struct sgx_numa_node *node;
     62};
     63
     64extern struct sgx_epc_section sgx_epc_sections[SGX_MAX_EPC_SECTIONS];
     65
     66static inline unsigned long sgx_get_epc_phys_addr(struct sgx_epc_page *page)
     67{
     68	struct sgx_epc_section *section = &sgx_epc_sections[page->section];
     69	unsigned long index;
     70
     71	index = ((unsigned long)page - (unsigned long)section->pages) / sizeof(*page);
     72
     73	return section->phys_addr + index * PAGE_SIZE;
     74}
     75
     76static inline void *sgx_get_epc_virt_addr(struct sgx_epc_page *page)
     77{
     78	struct sgx_epc_section *section = &sgx_epc_sections[page->section];
     79	unsigned long index;
     80
     81	index = ((unsigned long)page - (unsigned long)section->pages) / sizeof(*page);
     82
     83	return section->virt_addr + index * PAGE_SIZE;
     84}
     85
     86struct sgx_epc_page *__sgx_alloc_epc_page(void);
     87void sgx_free_epc_page(struct sgx_epc_page *page);
     88
     89void sgx_mark_page_reclaimable(struct sgx_epc_page *page);
     90int sgx_unmark_page_reclaimable(struct sgx_epc_page *page);
     91struct sgx_epc_page *sgx_alloc_epc_page(void *owner, bool reclaim);
     92
     93#ifdef CONFIG_X86_SGX_KVM
     94int __init sgx_vepc_init(void);
     95#else
     96static inline int __init sgx_vepc_init(void)
     97{
     98	return -ENODEV;
     99}
    100#endif
    101
    102void sgx_update_lepubkeyhash(u64 *lepubkeyhash);
    103
    104#endif /* _X86_SGX_H */